Filament or resistor for heating units or lamps.



high resistance, in the open air.

UNITED STATES PATENT OFFICE;

.HERSGI-IETJ C. PARKER AND WALTER G. CLARK, F NEW YORK N. Y., ASSIG-NORS '10 PARKER-CLARK ELECTRIC COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

FILAMENT OB RESISTOR FOR HEATING" UNITS OR LAMPS.

No Drawing.

To all whom it may concern:

Beit known that we, Hnnscnnn C. PAR- KER,v of the city of New Yo1'lr,coi.1nty of Kings, and State of New York, and \VAL'rnR G. CLARK, of the'city, county, and State of New York, have invented a new and useful Improvement in Filaments or Resistors for Heating Units or Lamps, of which the following is a full, clear, and exact description.

Our invention relates to improvements in resistors which can be usedas heating units for electrical heaters, or which can be used for incandescent electric lamps.

The object-of our invention 1s to produce a strong, rigid, high resistance conductor which will withstand vibration and which bination which we believe to be new and which will be hereinafter described, so that the resistor is capable of withstanding ahigh temperature, that is temperature of It is also an object of our invention to produce a resistor having a high specific resistance, but capable of conducting electricity when cold.

To produce the resistor we take a mixture of approximately two per cent. olefiant gas and the remainder or ninety-eight per cent. hydrogen. This is passed over a proper vaporizer containn'ig silicon tetra-chlorid and into a flashing jar. This may be rim up to atmospheric pressure or above, and the flashing carried out in the usual manner, or better results are obtained by working slightly above atmospheric pressure and allowing the gas to flow through the receiver: The fila ment, which is preferably of carbon, is

mounted in thefiashing jar precisely as is usual in flashing filaments, and the mixed gases of hydrogen and olefiant, together with the vapor of the silicon-tetra-chlorid, is admitted to the flashing jar, and the heat of the current passing through the filament causes the decomposition of the gases and the deposition of SiC on the heated filament. This process may be continued so that any size resistor may be obtained, that is the building up process can be carried forward to any desired point. When the current is turned on through the filament and the gases are decomposedjo build up the filament by deposition, the reaction is essen- Specification of Letters Patent. Pateniged N f2, 1j1(j,

Application filed May 20, 1909. Serial No. 497,313.

is made, such as composition of gases, temperatures, pressure, etc. This compound might be defined as a solution of carbon 1n carborundum SiC, but is one in' which the ratio of carbon to silicon is always greater than one atom of carbon to one atom of sili- .4. con. It has a very high specific resistance but still contains enough carbon to carry a current'when cold. It is more often silicon di-carbid butthe carbon content may be a little more or less than two atoms of carbon to one of silicon.

It. is not necessary to limitthe process to l the use of olefiant gas, as other gases can be used although they are not so easily controlled. Forinstance we find that instead of olefiant gas we can use marsh gas, acetylene,-benzol, the vapors of acetic aldehyde, or sulfuric ether. The reaction which takes place is as follows. The carbon is given iip to the silicon, forming Sicthe chlorin thus freed 'ii'nites with the hydrogen present, forming HCl. The products after the rea'c tion are SiC HCI and H.

lVe are aware that a silicon carbid has heretofore been produced, viz.the well known carborundum, SiC. and also that silicon and carbon' have been united mechanically vin many ways, but so far as ,we.

Letters Patent 1. As an improved article of manufacture, a filament composed essentially of silicon -dicarbid.

tion, we claim as new and desire to secure by,

Correction in Letters at ent No. 976,207.

2. A non-metallic filament which when cold is a conductor of electricity throughout its mass and which will glow continuously at incandescence in the open air upon the passage of an electric current through it.

3. As an improved article of manufacture, a resistor in filament form consisting of a core )1 base with a non-metallic coating thereon the whole when cold being a conductor of electricity throughout its mass and which will glow continuously in the open air at a temperature of incanclescence.

4. A non-metallic filament or resistor which when cold permits the passage of an electric current throughout its mass, and which under currentresistance maintains continuously in the open air a temperature about 1500 degrees C;

5. A non-metallic resistor in which the Whole body-is a conductor of electricity when cold and which glows at high incan- Signed,and'sealed'this 10th day of January, A. 1)., 1911.

solution of carbon in carborundum in which the ratio of carbon and silicon is always greater than one atom of carbonto one atom of silicon.

' HERSCHEL C. PARKER.

WALTER G. CLARK. WVitnesses:

human B. HU'rcHiNsoN; FRANK L. STUBBS.

lt is hcreby certified that in Letters Patent No. 976,207; granted November 22, K v 191), upon the application of Herschel C. Parker and Walter G. Olark of New York, N. Y for an improvement in Filaments or Resistors for Heating Units 01 L21I1lpS, an error appears in the printed specification requiring correction-as followsi Page 2, line 18, the Word about should read above, and that the said 1 Letters Patent should beread with this correction therein that the same may I conform to -'the record of the ease in the Patent Ofliee.

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Correction in Letters at ent No. 976,207.

2. A non-metallic filament which when cold is a conductor of electricity throughout its mass and which will glow continuously at incandescence in the open air upon the passage of an electric current through it.

3. As an improved article of manufacture, a resistor in filament form consisting of a core )1 base with a non-metallic coating thereon the whole when cold being a conductor of electricity throughout its mass and which will glow continuously in the open air at a temperature of incanclescence.

4. A non-metallic filament or resistor which when cold permits the passage of an electric current throughout its mass, and which under currentresistance maintains continuously in the open air a temperature about 1500 degrees C;

5. A non-metallic resistor in which the Whole body-is a conductor of electricity when cold and which glows at high incan- Signed,and'sealed'this 10th day of January, A. 1)., 1911.

solution of carbon in carborundum in which the ratio of carbon and silicon is always greater than one atom of carbonto one atom of silicon.

' HERSCHEL C. PARKER.

WALTER G. CLARK. WVitnesses:

human B. HU'rcHiNsoN; FRANK L. STUBBS.

lt is hcreby certified that in Letters Patent No. 976,207; granted November 22, K v 191), upon the application of Herschel C. Parker and Walter G. Olark of New York, N. Y for an improvement in Filaments or Resistors for Heating Units 01 L21I1lpS, an error appears in the printed specification requiring correction-as followsi Page 2, line 18, the Word about should read above, and that the said 1 Letters Patent should beread with this correction therein that the same may I conform to -'the record of the ease in the Patent Ofliee.

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